Profitability is one of the foundations for industrial sustainable development. In general, cost and performance have to be balanced in an industrial system. This is one of the incentives for developing systematic methods to analyse the trade-offs between two or more objectives, i.e. costs and emissions, energy utilisation, material efficiency, and other resources. Process Integration is a common name for system oriented methods and integrated approaches to complex industrial process plant design. It is a multi disciplinary approach which consists of mathematical, thermodynamic and economic models and methods.Eco-Efficiency is a concept which brings together economic and environmental progress by consideration of on one side the product value and on the other side the environmental influence in the product manufacture. In this paper a general Process Integration model for iron- and steelmaking to be used for evaluation of the Eco-Efficiency in steelmaking is proposed. The Process Integration model is a Mixed Integer Linear Programming (MILP) model which covers different production routes.